Filewatcher nodejs

const events = require("events"),
  util = require("util");

const fs = require("fs"),
  watchDir = "./watch",
  processedDir = "./done";
  
  /*Let's extend events.EventEmitter in order to be able
  to emit and listen for event*/
  
  class Watcher extends events.EventEmitter {
  constructor(watchDir, processedDir) {
    super();
    this.watchDir = watchDir;
    this.processedDir = processedDir;
  }

/* Cycles through directory and process any file
found emitting a process event for each one*/

  watch() {
    const watcher = this;
    fs.readdir(this.watchDir, function(err, files) {
      if (err) throw err;
      for (let index in files) {
        watcher.emit("process", files[index]);
      }
    });
  }

/* Start the directory monitoring 
leveraging Node's fs.watchFile */

  start() {
    var watcher = this;
    fs.watchFile(watchDir, function() {
      watcher.watch();
    });
  }
}
 
 /* Let's instantiate our Watcher object 
 passing to the constructor our folders path */
 
let watcher = new Watcher(watchDir, processedDir);


/*Let's use the on method inherited from 
event emitter class to listen for process 
events and move files from source folder 
to destination*/

watcher.on("process", function process(file) {
  const watchFile = this.watchDir + "/" + file;
  const processedFile = this.processedDir + "/" + file.toLowerCase();
  fs.rename(watchFile, processedFile, function(err) {
    if (err) throw err;
  });
});

/*Start it!!!*/

watcher.start();

Source: codementor.io

Similar codes

8 votes412 views1 answer
Uninstall node js from mac
Javascript Node.js
3 votes311 views1 answer
Node js console log object
Javascript Node.js
6 votes302 views3 answers
Get random number node js
Javascript Node.js
0 vote291 views1 answer
Objectid is not defined node js mongodb
Javascript Node.js
1 vote294 views2 answers
Node js split
Javascript Node.js
0 vote307 views1 answer
Node Folder or file exists
Javascript Node.js
0 vote301 views1 answer
Manage nodejs versions on windows
Javascript Node.js
-2 votes312 views2 answers
Referenceerror document is not defined node js
Javascript Node.js
0 vote324 views1 answer
S3 list objects in folder node js
Javascript Node.js
16 votes295 views2 answers
How to create an array in node js
Javascript Node.js